CUED Publications database

Direct measurement of charge transport through helical poly(ethyl propiolate) nanorods wired into gaps in single walled carbon nanotubes.

Wang, N and Zhang, Y and Yano, K and Durkan, C and Plank, N and Welland, ME and Unalan, HE and Mann, M and Amaratunga, GA and Milne, WI (2009) Direct measurement of charge transport through helical poly(ethyl propiolate) nanorods wired into gaps in single walled carbon nanotubes. Nanotechnology, 20. 105201-.

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Abstract

We report the direct measurement of electrical transport through rod-like polymer molecules, of poly(ethyl propiolate) (PEP), utilizing single walled carbon nanotubes (SWNTs) as electrodes. The electrical properties of the devices were measured (i) before cutting a SWNT, (ii) when a SWNT was cut and (iii) after PEP deposition into the nanoscale gap in a cut SWNT. The gate-dependent electrical properties showed a reduction in current from I(on) = 2.4 x 10(-7) A for SWNT devices to I(on) = 3.6 x 10(-9) A for PEP bridge devices, both with the ON/OFF ratio of 10(4). Similarly, metallic SWNT devices showed a reduction in current from a few hundreds of microA for a SWNT device to a few nA for a PEP-SWNT structure. The current density of a single PEP molecule is 10(5)-10(6) A cm(-2), which is relatively high, indicating that the PEP molecule can carry significant current. Use of SWNT electrodes was seen to be an effective method of contacting PEP nanorods to facilitate electrical measurements.

Item Type: Article
Uncontrolled Keywords: Alkynes Crystallization Electric Conductivity Electron Transport Macromolecular Substances Materials Testing Microelectrodes Molecular Conformation Nanostructures Nanotechnology Particle Size Propionates Semiconductors Surface Properties
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:21
Last Modified: 06 Oct 2014 01:23
DOI: 10.1088/0957-4484/20/10/105201